Fortuna Düsseldorf won promotion last season but find themselves bottom of the Bundesliga. Left-back Diego Contento has been ruled out for the season with a cruciate ligament tear and they are looking for someone to provide competition for Niko Gießelmann.

Town have close links with Fortuna. A group of the German clubs fans have adopted Ipswich as their English club and regularly travel over to attend games at Portman Road. Ipswich played a pre-season friendly over there in 2015.

Knudsen is closing in on 150 appearances for the Blues having arrived from his native Esbjerg in 2015 for a fee of £300k. He went to the World Cup back in the summer and recently earned his sixth full cap for Denmark.

While on international duty recently he told the Danish press: “I have to look after myself. I’ve played over 160 matches lately and have not heard anything, so that’s how it is.

“I’m very open. I have always said that I like England, but I do not exclude other possibilities. If anything comes from other countries, Germany, Italy, France, Spain, I’m open to it.

“I’ve had a great deal in England over the past three-and-a-half years, and if something comes from outside, I’m ready for it.”